The word actinomycins is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 25
Highest Scoring Words With Friends™ Play In The Letters actinomycins
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Seven Letter Word Alert: (36 words)
actinic, actions, amnions, animist, anionic, anoints, anonyms, antonym, atomics, atonics, caconym, canonic, cantons, canyons, cations, contain, cyanins, cystoma, cytomas, iconism, iconist, incants, mansion, masonic, minions, miscoin, mycotic, myotics, nations, niacins, nicosia, nomancy, sciatic, somatic, somitic, stannic